Circulator Pump Questions

[oldcpecdr]

Hi all

Beginning of the heating season I asked here about sealing a leaky boiler. Ended up installing a slightly used Weil Mclean Gold Series Boiler and it installed easily and has worked perfectly all winter.

I have a 4 zone system controlled by zone valves and all the controls are wired as they were in the old boiler. I installed a separate electric water heater and no longer heat domestic hot water with the boiler.

I have a Honeywell Aquastat L8148A and it calls for the circulator pump (Taco 007) to be wired to the C1 and L2 terminals on the circuit board. In those positions the pump runs 24-7 and never shuts off .. is that normal operation or is there a way to wire the circulator to turn on only when the thermostat in a zone is calling for heat ? I tried using C1 and C2 and it has constant current also. Do I need another separate relay for the circulator to be controlled by the thermostats ?
Thanks... Mike B

 

[brewchief]

You have the end switches on the zone valves connected to the thermostat terminals correct? Does the boiler maintain temp all the time even with no calls for heat?

Was the old method of heating water a tankless coil in the boiler? If so it would have been set up to maintain temp all the time.

What brand of zone valves?

 

[oldcpecdr]

Yes Brewchief

End switches are wires to t-stats, never disconnected them just slid the new boiler in place. Boiler maintains temperature all the time.

Old method of DHW was a Boilermate (don't ever buy one) with its own built in coil and used a separate zone and circulator.

Taco 571 Bronze Zone Valves

 

[brewchief]

What wires are connected to the zone valves where?
If you disconnect the wires at the t-stat terminals on the aquastat does the pump shut off?

 

[oldcpecdr]

Removing a thermostat wire at the Aquastat shuts off the relay and the pump goes off.

The Zone valves (4) each have two thermostat wires connected to the bottom two terminals, and then appear to be powered in parallel from the transformer.

The valves work and open when thermostat is raised calling for heat and close when heat is not being called for.

Mike B

 

[brewchief]

When all the zone valves are closed the pump should be off, I think there may be a wiring issue with the zone valves. Does the wiring match up to this?
http://www.google.com/url?sa=t&sour...MtR52LqaA&sig2=xTZDiupIdgyzARtrxPzluw&cad=rja

 

[oldcpecdr]

Thanks


I printed out the schematic and will check it out tomorrow.

Mike B